Supporting plate for electrical condensers



Dec. 7, 1926. 1,610,051

G. HILL SUPPORTING PLATE FOR ELECTRICAL CONDENSERS Filed may 16, 1921 2 Sheets-Sheet 1 anuawoz anar/n et,

Dec. 7, 1926. 1,610,051

G. HILL SUPPORTING PLATE FOR ELECTRICAL CONDENSERS Filed May 16, 3.921 2 Sheets-Sheet 2 Patented Dec. 7, 1926.

UNITED STATES PATENT OFFICE.

GUY HILL, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO WIRED RADIO, INC., 0F NEW YORK` N. Y., A CORPORA- TION OF DELAWARE.

SUPPORTING PLATE FOR ELECTRICAL CONDENSERS.

Applicationled May 1G, 1921.

This invention is a modified form. of the construction disclosed in Patent No. 1,408,- 738.

This invention relates to an improved construction of insulation for the supporting plates of a condenser, and it is applicable either to a variable air condenser or to a fixed air condenser and the same principles also apply if oil is used instead of air between the plates and also if any other dielectricis used.r

The invention is particularly valuable when applied to either fixed or variable condensers used in radio telegraph and radio telephone systems, although it is of value for other analogous work.

The main object of the invention is to construct an insulating supporting plate f'or a condenser having one or more metallic bushings molded into the plate.

Another object of the invention is to constructa novel insulating structure by means of which there may be molded into each of the supporting insulating discs a metallic plate which can serve as one of the fixed plates of the condenser. By this means the strength of the. supporting plates will be increased mechanically and also considerable space will be eliminated so that a con denser of greater capacity can be construct ed.

Another object of my invention is to provide such a structure to consist of but few parts, simple and inexpensive to manufacture.

Another object of my invention is to obviate the mechanical and electrical defects found in prior structures of this character.

Other objects will appear from the sublioined specification and claims,

Referring to the drawings:

Fig. 1 is a top view of one of the sup porting plates of the condenser.

Fig. 2 is a section of the condenser on the line A-A of Fig. 1.

Fig. 3 is a section of the supporting plate shown in Fig. 1 on the line B-B of that figure.

Fig. 4 is a plan view of a portion Vof a supporting plate similar to Fig. 1,' but showing a different form of bushing and insulating material adjacent to the bushing.

Fig. 5 is a plan view of another form of supporting plate.

Serial No. 469,965.

Fig. 6 is a section onthe line C-C of in-y sulating plate shown in Fig. 5.

Fig. 7 is a plan view of a modified form of one of the condenser supporting plates embodying my invention.

Fig. 8 is a section on line D-D of Fig. 7.

lVhile the illustrations and constructions shown yin the drawings relate more particularly to a variable air condenser, as nas been stated above the same principles apply to a `fixed air condenser and likewise also apply if oil is used instead of air between the plates, and also when any other dielecH tric is used.

The structure illustrated is a simple form of variable air condeuserrwith my invention embodied therein. It is therefore only necessary to generally describe the structure of the condenser in order to clearly understand the structure and efiicacy of my invention.

Referring to Fig. 2, the condenser con sists of the upper and lower fixed plates l, which are the main supporting plates or discs, and they are held in place by metal clamping rods 6, which are here conventionally shown, but may be of any approved construction, they plates being secured to the rods by suitable nuts 7. 2 are the fixed metal plates in electrical contact with the metal rods 6. l0 are the rmovable plates in electrical contact with they shaft 8. and these fixed plates and movable plates are respectively separated on the supporting rods 6 and the shaft 8 by suitable spacers, as well understood in the art. A handle 9 is secured to the shaft 8 by means of which the lshaft may be turned in bushing 5. Since the invent-ion relates specifically to the. details of the supporting plates l, a detailed description of the construction of the condenser itself n which the supporting plates are to be used is not considered necessary.y as it forms no part of this invention.

Each of the supporting insulating' plates l has a fixed plate 2 secured thereto by molding them, in the event that the plate is made of moldable insulating material. I also provide bushings such as 2l and 22, as illustrated in Fig. 6 in an insulating supporting plate 20, or a combination of bushings 8, et and 5, as illustrated in Fig. 3. together with a metallic plate 2, also shown in Figs. 2 and 3, by molding the insulating (ifi plate thereto during the process ot manulacture.

The metallic bushings such as 3, l and 5 shown in Fig. 3 can be made liush with the insulating material or they can 'extend slightly above the material, as illustrated for instance in Fig. el, in order that no strain will be put upon the insulating plate l, when the supporting rods are clampedin place.

Fig. 4 illustrates another form of bushing which is ot greater length than the thickness ot the 'insulating plate proper as shown at 20 so that a longer bearing surface if desired vcan be obtained. The insulating material adjacent to the bushing is shown corrugated in order that greater leakage surface insulationmay be obtained, and the outer sur- `tace ot the bushing is provi-ded with means to eil'ectually anchor the same to the plate.

Referring to Fig. 8 the bushing 5 is separated troin the plate 2 'by insulating mate rial, as lthe bushingl 5 is Connected to the mov'ableplates of the condenser, while the plate 2 as stated above forms one oi' the fixed plates ot the condenser. The metal bushing t is supported entirely in the insulating material, but the metal bushing 3, however, can be in electrical 'Contact with the metallic plate 2 since the bushing 3 is in electrical contact with the supporting rod -6 which holds all the fixed plates ot the condensers and it would therefore be at the same polarity the 'i'iXed plate 2 and tixed plate '2'.

As clearly illustrated in Figs. 7 and 8, l may provide a supporting plate l2 substantially one hall ot which is m-ade entirely ot metal 22 and the other half 32 of solid insulating material as distinguished from the structure shown and described in Figs. l, 2

and 3, 'in which the condenser plate is molded at one side and 'to one surface of the nsula'tor plate.

The two parts 22 'and 32 are securedV together by the formation 35 between the adjoining edges of the metal on the one hand and the insulation on the other, as clearly shown 'in the drawing.

ln the construction ot thisdevice it is only necessary to provide holes 62 through the metal portion of the'supporting plate tor the reception ot three ot the connecting rods 6 `'and a bushing 42 secu-red to the insulation by molding it thereto, as illustrated in Fig. 3. T ie bushing 30 is secured to the insulation at the center of the entire structure b'y molding the same thereto Vin -a manner above described with respect to the bushings 5 and 2l. y l

As lchanges of construction could be made within the scope ol my invention, it is 1intended that all 'matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention what l claim as--new and desire to secure by Letters Patent is: y

l. A supporting plate lot insulating material having 'a substantially semi-circular metallic plate secured 'thereto rby a tongue and groove joint in position -to act as a plate ot' a variable condenser 'and having metallic bushings extending through Jhe plate of insulating material and insulated from sai-d metal plate and lprojecti'ng slightly beyond the tace ol' said plate o ins'ulatmg material.

2. A supporting plate of insulating material having a substantially semi-'circular metallic plate secured thereto by a tongue and groove joint in 'position to act asia plate ot a variable condenser and having metallic bushings extending through the plate 'of insulating `material and insulated trom said metallic plate. l

In witness whereof, l have hereunto set my hand at Vashington, District of Columbia, this 23d day ot April, 1921@ v GUY HILL. 

